Question High CPU Usage Causes Input Lag

Jan 22, 2020

When I'm playing Destiny 2 or Rainbow Six Siege I experience a lot of (keyboard) input delay.
The input delay isn't constant but it happens at least once every Round in R6S and every 1-2 minutes in Destiny 2 (more enemies == more often).
I think it has to do something with my high CPU usage when playing said games, weird thing is that when playing another game called Rust that also brings my total CPU usage to 95-100% never has any issues.

The only thing that has helped a tiny bit in Destiny 2 is setting the Applications Priority to Low.

Pc Specs:
Cpu: i7-6700K @ 4.6ghz
Cooler: Noctua NH-D15
Motherboard: Asus Z170 Pro Gaming
Ram: 2x8gb @ 2133mhz
Gpu: MSI 1070 Gaming X 8G
Psu: ~7 year old 650W
HDD: ~7 year old 500gb 7200RPM
SSD: Samsung 970 Evo Plus 500gb (m.2)
Windows & Game installation: Both windows and the said games are located on the SSD.
Monitor resolution and Hz: 3x 1920x1080, 2x60hz and main screen is 144hz.

Temps while playing Destiny 2 or Rainbow Six Siege: (MSI Afterburner, HWInfo)
CPU: ~58* (50% fan speed)
GPU: ~62* (80% fan speed)
Both temps look fine to me, so no need to up fan speeds and increase noise.
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